com.netflix.loadbalancer

Class ResponseTimeWeightedRule

java.lang.Object

com.netflix.loadbalancer.AbstractLoadBalancerRule

com.netflix.loadbalancer.RoundRobinRule

com.netflix.loadbalancer.ResponseTimeWeightedRule

All Implemented Interfaces:

com.netflix.client.IClientConfigAware, IRule

Deprecated.

Use WeightedResponseTimeRule

public class ResponseTimeWeightedRule
extends RoundRobinRule

Rule that use the average/percentile response times to assign dynamic "weights" per Server which is then used in the "Weighted Round Robin" fashion.

The basic idea for weighted round robin has been obtained from JCS The implementation for choosing the endpoint from the list of endpoints is as follows:Let's assume 4 endpoints:A(wt=10), B(wt=30), C(wt=40), D(wt=20).

Using the Random API, generate a random number between 1 and10+30+40+20. Let's assume that the above list is randomized. Based on the weights, we have intervals as follows:

1-----10 (A's weight)
11----40 (A's weight + B's weight)
41----80 (A's weight + B's weight + C's weight)
81----100(A's weight + B's weight + C's weight + C's weight)

Here's the psuedo code for deciding where to send the request:

if (random_number between 1 & 10) {send request to A;}
else if (random_number between 11 & 40) {send request to B;}
else if (random_number between 41 & 80) {send request to C;}
else if (random_number between 81 & 100) {send request to D;}

When there is not enough statistics gathered for the servers, this rule will fall back to use RoundRobinRule.

See Also:

WeightedResponseTimeRule

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_TIMER_INTERVAL Deprecated.
protected java.util.concurrent.atomic.AtomicBoolean	serverWeightAssignmentInProgress Deprecated.
protected java.util.Timer	serverWeightTimer Deprecated.
static com.netflix.client.config.IClientConfigKey<java.lang.Integer>	WEIGHT_TASK_TIMER_INTERVAL_CONFIG_KEY Deprecated.

Constructor Summary

Constructors

Constructor and Description
ResponseTimeWeightedRule() Deprecated.
ResponseTimeWeightedRule(ILoadBalancer lb) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
Server	choose(ILoadBalancer lb, java.lang.Object key) Deprecated.
void	initWithNiwsConfig(com.netflix.client.config.IClientConfig clientConfig) Deprecated.
void	setLoadBalancer(ILoadBalancer lb) Deprecated.
void	shutdown() Deprecated.

Methods inherited from class com.netflix.loadbalancer.RoundRobinRule

choose

Methods inherited from class com.netflix.loadbalancer.AbstractLoadBalancerRule

getLoadBalancer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

WEIGHT_TASK_TIMER_INTERVAL_CONFIG_KEY

public static final com.netflix.client.config.IClientConfigKey<java.lang.Integer> WEIGHT_TASK_TIMER_INTERVAL_CONFIG_KEY

Deprecated.

DEFAULT_TIMER_INTERVAL

public static final int DEFAULT_TIMER_INTERVAL

Deprecated.

See Also:

Constant Field Values

serverWeightTimer

protected java.util.Timer serverWeightTimer

Deprecated.

serverWeightAssignmentInProgress

protected java.util.concurrent.atomic.AtomicBoolean serverWeightAssignmentInProgress

Deprecated.

Constructor Detail

ResponseTimeWeightedRule

public ResponseTimeWeightedRule()

Deprecated.

ResponseTimeWeightedRule

public ResponseTimeWeightedRule(ILoadBalancer lb)

Deprecated.

Method Detail

setLoadBalancer

public void setLoadBalancer(ILoadBalancer lb)

Deprecated.

Specified by:

setLoadBalancer in interface IRule

Overrides:

setLoadBalancer in class AbstractLoadBalancerRule

shutdown

public void shutdown()

Deprecated.

choose

public Server choose(ILoadBalancer lb,
            java.lang.Object key)

Deprecated.

Overrides:

choose in class RoundRobinRule

initWithNiwsConfig

public void initWithNiwsConfig(com.netflix.client.config.IClientConfig clientConfig)

Deprecated.

Specified by:

initWithNiwsConfig in interface com.netflix.client.IClientConfigAware

Overrides:

initWithNiwsConfig in class RoundRobinRule